opengl es纹理贴图效果实例

一、先准备好一张用来贴图的照片

二、纹理效果代码：

gl.glEnable(GL10.GL_TEXTURE_2D);
        // 创建纹理
        gl.glGenTextures(1, textureids, 0);
        // 绑定要使用的纹理
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textureids[0]);
        // 生成纹理
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
        // 线性滤波
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,
                GL10.GL_LINEAR);
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,
                GL10.GL_LINEAR);

三、实例代码

1、Activity类代码

import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

public class TieTuGLActivity extends Activity {
    MyRender myRender;
    GLSurfaceView glSurfaceView;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        initBitmap.init(this.getResources());
        glSurfaceView = new GLSurfaceView(this);
        myRender = new MyRender(this);
        glSurfaceView.setRenderer(myRender);
        setContentView(glSurfaceView);
    }
}

2、初始化bitmap类

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

public class initBitmap {

	public static Bitmap bitmap;
	
	public static void init(Resources res){
		bitmap = BitmapFactory.decodeResource(res, R.drawable.beach) ;
	}
}

3、渲染类

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.graphics.Bitmap;
import android.opengl.GLSurfaceView.Renderer;
import android.opengl.GLUtils;

public class MyRender implements Renderer {

    public Context context;
    private int one = 0x10000;
    private Bitmap bitmap;
    private int[] textureids;
    private IntBuffer vertexBuffer;
    private IntBuffer texBuffer;
    // 旋转方向
    private float xrot, yrot, zrot;
    // 正方体顶点
    private int[] vertices = {
            one, one, -one,  
            -one, one, -one,
            one, one, one,
           
            -one, one, one,
            one, -one,one,
            -one, -one, one,
           
            one, -one, -one,
            -one, -one, -one,
            one, one,one,
           
            -one, one, one,
            one, -one, one,
            -one, -one, one,
           
            one, -one,-one,
            -one, -one, -one,
            one, one, -one,
           
            -one, one, -one,
            -one, one,one,
            -one, one, -one,
           
            -one, -one, one,
            -one, -one, -one,
            one, one,-one,
           
            one, one, one,
            one, -one, -one,
            one, -one, one
        };

    //纹理点
    private int[] texCoords = {  
            0, one,                
            one, one,
            0, 0,
            one, 0
    };

    public MyRender(Context context) {
        this.context = context;
        // 初始化
        textureids = new int[1];
        // 实例化bitmap
        bitmap = initBitmap.bitmap;

        ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
        vbb.order(ByteOrder.nativeOrder());
        vertexBuffer = vbb.asIntBuffer();
        vertexBuffer.put(vertices);
        vertexBuffer.position(0);

        ByteBuffer tbb = ByteBuffer.allocateDirect(texCoords.length * 4 * 6);
        tbb.order(ByteOrder.nativeOrder());
        texBuffer = tbb.asIntBuffer();
        //为每一个面贴上纹理
        for (int i = 0; i < 6; i++) {
            texBuffer.put(texCoords);
        }
        texBuffer.position(0);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        // 清除深度和颜色缓存
        gl.glClear(GL10.GL_DEPTH_BUFFER_BIT | GL10.GL_COLOR_BUFFER_BIT);
        gl.glLoadIdentity();
        //开启顶点和纹理缓冲
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glEnableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
        //设置点点和纹理
        gl.glVertexPointer(3, GL10.GL_FIXED, 0, vertexBuffer);
        gl.glTexCoordPointer(2, GL10.GL_FIXED, 0, texBuffer); 
       
        //向z轴里移入6.0f
        gl.glTranslatef(0.0f, 0.0f, -6.0f);
        // 设置3个方向的旋转
        gl.glRotatef(xrot, one, 0.0f, 0.0f);
        gl.glRotatef(yrot, 0.0f, one, 0.0f);
        gl.glRotatef(zrot, 0.0f, 0.0f, one);

        // 绘制正方体
        for (int i = 0; i < 6; i++) {
            gl.glDrawArrays(GL10.GL_TRIANGLE_STRIP, i * 4, 4);
        }

        gl.glDisableClientState(GL10.GL_TEXTURE_COORD_ARRAY);
        gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);

        // 设置旋转角度
        xrot += 0.5f;
        yrot += 0.4f;
        zrot += 0.6f;
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        // 视角
        gl.glViewport(0, 0, width, height);
        float ratio = (float) width / height;
        // 观察模式
        gl.glMatrixMode(GL10.GL_PROJECTION);
        // 重置观察布局
        gl.glLoadIdentity();
        gl.glFrustumf(-ratio, ratio, -1, 1, 1, 10);
        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {

        // 告诉系统对透视进行修正
        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
        // 黑色背景
        gl.glClearColor(0, 0, 0, 0);
        // 启用阴影平滑
        gl.glShadeModel(GL10.GL_SMOOTH);

        // 清除深度缓存
        gl.glClearDepthf(one);
        // 启用深度测试
        gl.glEnable(GL10.GL_DEPTH_TEST);
        // 所做深度测试的类型
        gl.glDepthFunc(GL10.GL_LEQUAL);

   
       
        gl.glEnable(GL10.GL_TEXTURE_2D);
        // 创建纹理
        gl.glGenTextures(1, textureids, 0);
        // 绑定要使用的纹理
        gl.glBindTexture(GL10.GL_TEXTURE_2D, textureids[0]);
        // 生成纹理
        GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);
        // 线性滤波
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,
                GL10.GL_LINEAR);
        gl.glTexParameterx(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,
                GL10.GL_LINEAR);
    }
}

四、运行效果图：